Pitman-rod



(No Model.) I

l D. M-IGHAE-LS;

PITMAN ROD. v

.... m No. 310,707. Patented Jan. 13, 1885.

liiii VIZ 425153525. I ZE VEZYIEJ Zzv f Nrrnn Starts PATENT @rrrcn.

DENNIS MIOHAELS, OF HOPEDALE, OHIO.

PITMAN=ROD.

SPECIFICATION fprming part of Letters Patent No. 310,707, dated January 13, 1885.

Application filed November 20, 1884.

(No model.)

To all whom it nuty concern:

Be it known that I, DENNIS MIOHAELS, a citizen of the United States, residing at Hopedale, in the county of Harrison and State of Ohio, have invented certain new and useful Improvements in Pitman-Rods; and I do declare the following to be a full, clear, and eX- act description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to pitmen intended, especially, for use on harvesting-machines; and its main object is to provide convenient and easily-operated means for adjusting the wrist pin or pins to take up the wear in the rings or bearings of the devices which the pitman is used to connect.

The invention consists in certain novel constructions, which will first be described, and then specifically pointed out in the claims.

In the drawings, Figure 1 is aplan and Fig. 2 a side view of my pitman. Figs. 3 and 4 are detail views of the movable sections; Fig. 5, a detail view of the main section.

The main section A is provided at one or both ends with segments B of wrist-pins. These segments are approximately semicircular in crosssection. Slots 0 O are formed through the main bar and elongated in the direction of length thereof. The movable sections D are lapped alongside the main section and pro vided with segmental pins E, which, with segments B, form complete wrist-pins. These movable sections are provided with slots F, elongated, like slots O,in the direction oilength of the section.

In operation slots F and O register, and the bolts G, for clamping the sections together, are passed through such slots. By loosening bolts G the sections may be moved longitudinally along each other, so as to set the segments to or from each other, in order to reduce or increase the cross-sectional area of the wrist'pin, and by tightening the screws G the sections may be held at any desired point of adjustment.

It is manifest that the screw-openings need be elongated in only one of the sections; but

I prefer to so form them in both, as thereby a greater degree of adjustment is permitted. It is also evident that instead of the clampingscrews clips might be passed around the sections, or other suitable expedients employed for securing the two sections together.

The construction before described provides for the adj ustment of the segments to and from each other. I have also found it desirable to divide one or both of the segments 1011- gitudinally and adjust the divisions thereof apart, so as to increase the area of the wristpin laterally. To secure this lateral spreading a wedge might be driven between the divided portions of the segment.

In practice it is preferred to form the end of section carrying the divided segment adjacent to said segment with a slot, H, communicating with the slit or division of such segnrent, and to adjust its divisions by devices operating in such slot. For such purpose a shaft or screw suitably journaled could be turned through slot H, and provided with cams or wipers arranged to bear against the side walls of slot H, and so spread the divisions of the segment apart. I prefer, however, to employ the construction shown, which consists in forming the slot H tapering, with its apex toward the segment, and to project a bolt or pin from the other section through the tapering slot, so that as the sections are moved 1ongitudinally along each other the said pin will impinge on the inclined walls of the slot and adjust the divisions of the segment apart.

It will be noticed that the divided segment may be that on the main section or on what, for convenience of reference, I have denominated the movable section.

By my invention the pitman pin or pins may be quickly adjusted to accurately fit the rings in which they are held, and so take up all wear, preventing the rattling and consequent jarring so disagreeable to the operator and injurious to the machine, as is well known.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a pitman, the combination, with the main section provided with a segment of a pin, of a movable section, also provided with a segment of a pin and adjustable along the main section, substantially as set forth.

2. In a pitman, the combination, with a section provided with a segment of a pin, of a second section, also provided with a segment of a pin, which segment is divided longitudinally, and means whereby the divisions of said pin may be spread laterally, substantially as set forth.

3. In a pitman, the combination, with one section provided with a segment of a pin, and a second section, also provided with a segment of a pin, which is divided longitudinally, one

of said sections being provided with a tapered slot, of a bolt or pin projected from the other section through said tapered slot, substantially as set forth. 15

In testimony whereof I affix my signature in presence of two witnesses.

DENNIS MIOHAELS. Vitnesses:

AMON LEMMON, J noon J ARVIS. 

